In simpler terms - they create an MCP server, essentially an API that the coding agent can call, that can fill in context about previous decisions done by the coding agent earlier in development. Agent equivalent of asking someone who's been working there longer "why is this this way".
This means that the agent will can have context of previous decisions, something that they currently struggle with as they are always starting from a blank slate.
Coding agents starting from a blank slate isn’t good practice to begin with. That’s a vibe coding practice, not a practice that you’d start with when you want to build a real business serving customers. You start with specifications and design documents; you don’t leave those decisions to agents (although you can use agents to help design them). So the context ought to be there already.
This means that the agent will can have context of previous decisions, something that they currently struggle with as they are always starting from a blank slate.